TY - JOUR
T1 - Solid-Solution Strengthening by Oxygen in Nb-Ta and Nb-Mo Single Crystals
AU - Miura, E.
AU - Yoshimi, Kyosuke
AU - Hanada, S.
PY - 2001/6/1
Y1 - 2001/6/1
N2 - We have investigated the high-temperature solid-solution strengthening by oxygen in Nb, Nb-Ta and Nb-Mo single crystals by compression tests with constant strain rate. Nb, Nb-20Ta, Nb-40Ta, Nb-20Mo, and Nb-40Mo single crystals with various O content were grown by use of the electron-beam floating zone melting method. It is found that Nb and Nb-Ta single crystals are strengthened by oxygen at temperatures below 1100 K, while Nb-20Mo single crystals are strengthened even at 1473 K. The critical resolved shear stress (c.r.s.s.) of Nb-Ta single crystals at 298 K increases linearly with increasing O content, irrespective of Ta content. Furthermore, the increment of c.r.s.s. of Nb-Ta single crystals is larger than that of Nb. The c.r.s.s. of Nb-Mo single crystals is higher than that of Nb for all temperatures tested, and the c.r.s.s. of Nb-20Mo single crystals also increases with increasing O content. These results indicate that the interstitial-substitutional (i-s) interaction between O and Ta or Mo affects the mechanical properties in the Nb-based alloys at high temperature.
AB - We have investigated the high-temperature solid-solution strengthening by oxygen in Nb, Nb-Ta and Nb-Mo single crystals by compression tests with constant strain rate. Nb, Nb-20Ta, Nb-40Ta, Nb-20Mo, and Nb-40Mo single crystals with various O content were grown by use of the electron-beam floating zone melting method. It is found that Nb and Nb-Ta single crystals are strengthened by oxygen at temperatures below 1100 K, while Nb-20Mo single crystals are strengthened even at 1473 K. The critical resolved shear stress (c.r.s.s.) of Nb-Ta single crystals at 298 K increases linearly with increasing O content, irrespective of Ta content. Furthermore, the increment of c.r.s.s. of Nb-Ta single crystals is larger than that of Nb. The c.r.s.s. of Nb-Mo single crystals is higher than that of Nb for all temperatures tested, and the c.r.s.s. of Nb-20Mo single crystals also increases with increasing O content. These results indicate that the interstitial-substitutional (i-s) interaction between O and Ta or Mo affects the mechanical properties in the Nb-based alloys at high temperature.
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U2 - 10.1002/1521-396X(200106)185:2<357::AID-PSSA357>3.0.CO;2-9
DO - 10.1002/1521-396X(200106)185:2<357::AID-PSSA357>3.0.CO;2-9
M3 - Article
AN - SCOPUS:1842788072
SN - 0031-8965
VL - 185
SP - 357
EP - 372
JO - Physica Status Solidi (A) Applied Research
JF - Physica Status Solidi (A) Applied Research
IS - 2
ER -